I still cannot believe how my relationship with my sweet little sister developed so intensely over the course of last two weeks. From growing up together where we were just curious about male and female bodies and teasing and spying on each other as young kids, to being adults and having an affair with each other in the office and engaging in a taboo relationship where a brother and sister explore each other's more secret sexual desires.
Our escapades in the men's room continued. For the next two days we repeated our ritual of going to the gym and not changing into regular clothes and coming back to the office when everyone was gone. We would go into the men's room, lock the stall door and slide our shorts off. I would tongue fuck my sister's gorgeous pussy and chew on her clitty and suck on her hard clitty while finger fucking her tight little ass hole. She loves having her ass hole played with. She loves my finger but she loves my tongue up her anus the best. She would then return the favor by sucking my cock, licking my balls and drinking my cum while sliding one finger in and out of my ass hole, driving me crazy.
Next day was Friday and we knew the cleaning folks did not work on Fridays. So there was no hurry to leave the office. We both went to the gym and came back in our shorts and tee shirts. All day my sister had been teasing me with her low cut v-neck shirt and her gorgeous milky cleavage showing. In the evening, before going to the gym she came to my office with two top buttons unbuttoned showing me her lacy bra and her amazing breasts. I was hard and horny and could not wait to tongue fuck her pussy. I could hardly concentrate on my workout. I came back to the office quickly and waited for my sister. It turned out that she could not wait either and had cut her workout short. We smiled at each other and I winked at her. i got up and started walking towards the men's room. I hadn't even reached my stall yet and my sweet sister was already behind me groping my butt.
As our routine I got down on my knees and started to tongue fuck my sister's pussy as I fingered fucked her anus. After she came several times I got up. My sister, instead of kneeling down in front of me to suck my cock like usual, turned around leaned forward against the wall and stuck her ass out to me. Not knowing what she wanted I got down onto my knees and started to tongue fuck her pussy from behind and started playing with her anus. I could see how her ass hole would open and close around my finger as my tongue darted in and out of her horny pussy. In this position my sister did not take more than two minutes to cum. It was intense for her. Instead of me shoving my tongue in and out of her pussy she was fucking my tongue with her pussy - literally banging my tongue like a cock in her pussy.
After she came on my tongue several times she pulled me up by my hair. She turned around, smiled at me, kissed me so she can taste her cum on my tongue, and then, while looking into my eyes slowly dropped my shorts down. Never taking her eyes away from my eyes she smiled and started to stroke my cock and massage my balls. After a couple minutes of teasing my fat cock she looked at me and whispered.
